No abstract

The role of the magnetic field in the emission properties of CsPbBr3 perovskite nanocrystals is investigated using magnetic materials, La0.67Sr0.33Mn0.9Co0.1O3 and La0.67Sr0.33Mn0.9Ni0.1O3. The ferromagnetic–paramagnetic phase transition point of these magnetic materials is near room temperature, and the intensity of the magnetic field can be controlled by changing the temperature. An increase of 51% and 33% is observed in the emission intensity of the CsPbBr3 perovskites, on increasing the temperature from 10 °C to 35 °C, in the presence of La0.67Sr0.33Mn0.9Ni0.1O3 and La0.67Sr0.33Mn0.9Co0.1O3, respectively. At lower temperatures, the samples are magnetic due to their ferromagnetic nature, and on increasing the temperature, they become non-magnetic. Magnetic materials as well as CsPbBr3 nanocrystals possess perovskite crystal structure, and this might be playing an important role in transmitting the magnetic field. By understanding the role of the magnetic field in the emission of CsPbBr3 perovskite nanocrystals, magnetic materials can be used to control the properties of CsPbBr3 nanocrystals for light energy harvesting and opto-electronic applications.

No abstract

No abstract

A magnetic dye‐adsorbent catalyst has been processed by subjecting the conventional magnetic photocatalyst to a hydrothermal process followed by typical washing and thermal treatments. It has been characterized using the transmission electron microscope, X‐ray diffraction, X‐ray photoelectron spectroscope, and Fourier transform infrared spectroscope for analyzing its morphology, structure, and surface chemistry. It consists of a composite particle having a “core‐shell” structure, with a magnetic particle as a core and nanotubes of dye adsorbent as a shell. The dye‐adsorption behavior of magnetic dye‐adsorbent catalyst and the conventional magnetic photocatalyst has been measured, under the dark condition, using methylene blue (MB) as a model catalytic dye agent. It has been demonstrated that, due to its higher specific surface area, the magnetic dye‐adsorbent catalyst removes an organic textile dye from an aqueous solution via surface adsorption mechanism, which is in contrast to the photocatalytic degradation mechanism, under the ultraviolet radiation exposure, associated with the conventional magnetic photocatalyst. It has been shown that, the magnetic dye‐adsorbent catalyst removes >99% of MB dye from an aqueous solution in just 30 min via surface adsorption mechanism. The magnetic dye‐adsorbent catalyst also possesses magnetic properties, which makes its removal from an aqueous solution possible using an external magnetic field after the dye‐adsorption process.